In 1993 and 2011, the Mississippi River (the largest river system in the US at some 2000 miles long) flooded. In '93, the flooding covered some 30,000 square miles of farmland. In 2011, it resulted in President Obama's declaring large portions of three states Federal Disaster Areas do to the flooding.
check it out and what you find may have the answers you seek. Records for both, including what was done to restore farmland, may be available from the Federal Emergency Management Agency (FEMA).
is now Captain Stoned
You are too straight to be a floral designer. - da Bunny
RIP Dad Apr 22, 1942 - Dec 2, 2011